465 lines
12 KiB
Perl
Executable file
465 lines
12 KiB
Perl
Executable file
#!/usr/bin/env perl
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use utf8;
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use strict;
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use warnings;
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use CPAN::Meta();
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use CPANPLUS::Backend();
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use Getopt::Long::Descriptive qw( describe_options );
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use JSON::PP qw( encode_json );
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use Log::Log4perl qw(:easy);
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use Readonly();
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# Readonly hash that maps CPAN style license strings to information
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# necessary to generate a Nixpkgs style license attribute.
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Readonly::Hash my %LICENSE_MAP => (
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# The Perl 5 License (Artistic 1 & GPL 1 or later).
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perl_5 => {
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licenses => [qw( artistic1 gpl1Plus )]
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},
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# GNU Affero General Public License, Version 3.
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agpl_3 => {
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licenses => [qw( agpl3Plus )],
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amb => 1
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},
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# Apache Software License, Version 1.1.
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apache_1_1 => {
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licenses => ["Apache License 1.1"],
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in_set => 0
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},
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# Apache License, Version 2.0.
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apache_2_0 => {
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licenses => [qw( asl20 )]
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},
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# Artistic License, (Version 1).
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artistic_1 => {
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licenses => [qw( artistic1 )]
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},
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# Artistic License, Version 2.0.
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artistic_2 => {
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licenses => [qw( artistic2 )]
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},
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# BSD License (three-clause).
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bsd => {
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licenses => [qw( bsd3 )],
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amb => 1
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},
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# FreeBSD License (two-clause).
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freebsd => {
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licenses => [qw( bsd2 )]
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},
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# GNU Free Documentation License, Version 1.2.
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gfdl_1_2 => {
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licenses => [qw( fdl12 )]
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},
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# GNU Free Documentation License, Version 1.3.
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gfdl_1_3 => {
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licenses => [qw( fdl13 )]
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},
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# GNU General Public License, Version 1.
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gpl_1 => {
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licenses => [qw( gpl1Plus )],
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amb => 1
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},
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# GNU General Public License, Version 2. Note, we will interpret
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# "gpl" alone as GPL v2+.
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gpl_2 => {
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licenses => [qw( gpl2Plus )],
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amb => 1
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},
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# GNU General Public License, Version 3.
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gpl_3 => {
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licenses => [qw( gpl3Plus )],
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amb => 1
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},
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# GNU Lesser General Public License, Version 2.1. Note, we will
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# interpret "gpl" alone as LGPL v2.1+.
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lgpl_2_1 => {
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licenses => [qw( lgpl21Plus )],
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amb => 1
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},
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# GNU Lesser General Public License, Version 3.0.
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lgpl_3_0 => {
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licenses => [qw( lgpl3Plus )],
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amb => 1
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},
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# MIT (aka X11) License.
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mit => {
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licenses => [qw( mit )]
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},
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# Mozilla Public License, Version 1.0.
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mozilla_1_0 => {
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licenses => [qw( mpl10 )]
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},
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# Mozilla Public License, Version 1.1.
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mozilla_1_1 => {
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licenses => [qw( mpl11 )]
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},
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# OpenSSL License.
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openssl => {
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licenses => [qw( openssl )]
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},
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# Q Public License, Version 1.0.
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qpl_1_0 => {
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licenses => [qw( qpl )]
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},
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# Original SSLeay License.
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ssleay => {
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licenses => ["Original SSLeay License"],
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in_set => 0
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},
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# Sun Internet Standards Source License (SISSL).
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sun => {
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licenses => ["Sun Industry Standards Source License v1.1"],
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in_set => 0
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},
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# zlib License.
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zlib => {
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licenses => [qw( zlib )]
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},
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# Other Open Source Initiative (OSI) approved license.
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open_source => {
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licenses => [qw( free )],
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amb => 1
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},
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# Requires special permission from copyright holder.
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restricted => {
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licenses => [qw( unfree )],
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amb => 1
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},
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# Not an OSI approved license, but not restricted. Note, we
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# currently map this to unfreeRedistributable, which is a
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# conservative choice.
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unrestricted => {
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licenses => [qw( unfreeRedistributable )],
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amb => 1
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},
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# License not provided in metadata.
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unknown => {
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licenses => [qw( unknown )],
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amb => 1
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}
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);
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sub handle_opts {
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my ( $opt, $usage ) = describe_options(
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'usage: $0 %o MODULE',
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[ 'maintainer|m=s', 'the package maintainer' ],
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[ 'debug|d', 'enable debug output' ],
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[ 'help', 'print usage message and exit' ]
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);
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if ( $opt->help ) {
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print $usage->text;
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exit;
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}
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my $module_name = $ARGV[0];
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if ( !defined $module_name ) {
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print STDERR "Missing module name\n";
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print STDERR $usage->text;
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exit 1;
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}
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return ( $opt, $module_name );
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}
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# Takes a Perl package attribute name and returns 1 if the name cannot
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# be referred to as a bareword. This typically happens if the package
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# name is a reserved Nix keyword.
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sub is_reserved {
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my ($pkg) = @_;
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return $pkg =~ /^(?: assert |
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else |
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if |
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import |
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in |
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inherit |
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let |
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rec |
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then |
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while |
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with )$/x;
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}
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sub pkg_to_attr {
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my ($module) = @_;
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my $attr_name = $module->package_name;
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if ( $attr_name eq "libwww-perl" ) {
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return "LWP";
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}
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else {
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$attr_name =~ s/-//g;
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return $attr_name;
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}
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}
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sub get_pkg_name {
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my ($module) = @_;
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return $module->package_name . '-' . $module->package_version;
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}
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sub read_meta {
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my ($pkg_path) = @_;
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my $yaml_path = "$pkg_path/META.yml";
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my $json_path = "$pkg_path/META.json";
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my $meta;
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if ( -r $json_path ) {
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$meta = CPAN::Meta->load_file($json_path);
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}
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elsif ( -r $yaml_path ) {
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$meta = CPAN::Meta->load_file($yaml_path);
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}
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else {
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WARN("package has no META.yml or META.json");
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}
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return $meta;
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}
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# Map a module to the attribute corresponding to its package
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# (e.g. HTML::HeadParser will be mapped to HTMLParser, because that
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# module is in the HTML-Parser package).
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sub module_to_pkg {
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my ( $cb, $module_name ) = @_;
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my @modules = $cb->search( type => "name", allow => [$module_name] );
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if ( scalar @modules == 0 ) {
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# Fallback.
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$module_name =~ s/:://g;
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return $module_name;
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}
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my $module = $modules[0];
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my $attr_name = pkg_to_attr($module);
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DEBUG("mapped dep $module_name to $attr_name");
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return $attr_name;
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}
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sub get_deps {
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my ( $cb, $meta, $type ) = @_;
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return if !defined $meta;
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my $prereqs = $meta->effective_prereqs;
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my $deps = $prereqs->requirements_for( $type, "requires" );
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my @res;
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foreach my $n ( $deps->required_modules ) {
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next if $n eq "perl";
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# Hacky way to figure out if this module is part of Perl.
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if ( $n !~ /^JSON/ && $n !~ /^YAML/ && $n !~ /^Module::Pluggable/ && $n !~ /^if$/ ) {
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eval "use $n;";
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if ( !$@ ) {
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DEBUG("skipping Perl-builtin module $n");
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next;
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}
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}
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my $pkg = module_to_pkg( $cb, $n );
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# If the package name is reserved then we need to refer to it
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# through the "self" variable.
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$pkg = "self.\"$pkg\"" if is_reserved($pkg);
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push @res, $pkg;
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}
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return @res;
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}
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sub uniq {
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return keys %{ { map { $_ => 1 } @_ } };
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}
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sub render_license {
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my ($cpan_license) = @_;
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return if !defined $cpan_license;
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my $licenses;
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# If the license is ambiguous then we'll print an extra warning.
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# For example, "gpl_2" is ambiguous since it may refer to exactly
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# "GPL v2" or to "GPL v2 or later".
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my $amb = 0;
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# Whether the license is available inside `stdenv.lib.licenses`.
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my $in_set = 1;
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my $nix_license = $LICENSE_MAP{$cpan_license};
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if ( !$nix_license ) {
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WARN("Unknown license: $cpan_license");
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$licenses = [$cpan_license];
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$in_set = 0;
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}
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else {
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$licenses = $nix_license->{licenses};
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$amb = $nix_license->{amb};
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$in_set = !$nix_license->{in_set};
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}
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my $license_line;
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if ( @$licenses == 0 ) {
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# Avoid defining the license line.
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}
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elsif ($in_set) {
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my $lic = 'stdenv.lib.licenses';
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if ( @$licenses == 1 ) {
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$license_line = "$lic.$licenses->[0]";
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}
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else {
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$license_line = "with $lic; [ " . join( ' ', @$licenses ) . " ]";
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}
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}
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else {
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if ( @$licenses == 1 ) {
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$license_line = $licenses->[0];
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}
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else {
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$license_line = '[ ' . join( ' ', @$licenses ) . ' ]';
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}
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}
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INFO("license: $cpan_license");
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WARN("License '$cpan_license' is ambiguous, please verify") if $amb;
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return $license_line;
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}
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my ( $opt, $module_name ) = handle_opts();
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Log::Log4perl->easy_init(
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{
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level => $opt->debug ? $DEBUG : $INFO,
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layout => '%m%n'
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}
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);
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my $cb = CPANPLUS::Backend->new;
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my @modules = $cb->search( type => "name", allow => [$module_name] );
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die "module $module_name not found\n" if scalar @modules == 0;
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die "multiple packages that match module $module_name\n" if scalar @modules > 1;
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my $module = $modules[0];
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my $pkg_name = get_pkg_name $module;
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my $attr_name = pkg_to_attr $module;
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INFO( "attribute name: ", $attr_name );
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INFO( "module: ", $module->module );
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INFO( "version: ", $module->version );
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INFO( "package: ", $module->package, " (", $pkg_name, ", ", $attr_name, ")" );
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INFO( "path: ", $module->path );
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my $tar_path = $module->fetch();
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INFO( "downloaded to: ", $tar_path );
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INFO( "sha-256: ", $module->status->checksum_value );
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my $pkg_path = $module->extract();
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INFO( "unpacked to: ", $pkg_path );
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my $meta = read_meta($pkg_path);
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DEBUG( "metadata: ", encode_json( $meta->as_struct ) ) if defined $meta;
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my @build_deps = sort( uniq(
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get_deps( $cb, $meta, "configure" ),
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get_deps( $cb, $meta, "build" ),
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get_deps( $cb, $meta, "test" )
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) );
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INFO("build deps: @build_deps");
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my @runtime_deps = sort( uniq( get_deps( $cb, $meta, "runtime" ) ) );
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INFO("runtime deps: @runtime_deps");
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my $homepage = $meta ? $meta->resources->{homepage} : undef;
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INFO("homepage: $homepage") if defined $homepage;
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my $description = $meta ? $meta->abstract : undef;
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if ( defined $description ) {
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$description = uc( substr( $description, 0, 1 ) )
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. substr( $description, 1 ); # capitalise first letter
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$description =~ s/\.$//; # remove period at the end
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$description =~ s/\s*$//;
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$description =~ s/^\s*//;
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$description =~ s/\n+/ /; # Replace new lines by space.
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INFO("description: $description");
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}
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#print(Data::Dumper::Dumper($meta->licenses) . "\n");
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my $license = $meta ? render_license( $meta->licenses ) : undef;
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INFO( "RSS feed: https://metacpan.org/feed/distribution/",
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$module->package_name );
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my $build_fun = -e "$pkg_path/Build.PL"
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&& !-e "$pkg_path/Makefile.PL" ? "buildPerlModule" : "buildPerlPackage";
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print STDERR "===\n";
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print <<EOF;
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${\(is_reserved($attr_name) ? "\"$attr_name\"" : $attr_name)} = $build_fun rec {
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name = "$pkg_name";
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src = fetchurl {
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url = "mirror://cpan/${\$module->path}/\${name}.${\$module->package_extension}";
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sha256 = "${\$module->status->checksum_value}";
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};
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EOF
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print <<EOF if scalar @build_deps > 0;
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buildInputs = [ @build_deps ];
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EOF
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print <<EOF if scalar @runtime_deps > 0;
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propagatedBuildInputs = [ @runtime_deps ];
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EOF
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print <<EOF;
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meta = {
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EOF
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print <<EOF if defined $homepage;
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homepage = $homepage;
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EOF
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print <<EOF if defined $description && $description ne "Unknown";
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description = "$description";
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EOF
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print <<EOF if defined $license;
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license = $license;
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EOF
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print <<EOF if $opt->maintainer;
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maintainers = [ maintainers.${\$opt->maintainer} ];
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EOF
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print <<EOF;
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};
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};
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EOF
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